Caster support



FIG. 1 is a perspective view of the caster support showing my new design, with broken lines being shown for illustrative purposes only, forming no part of the claimed design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side view thereof with the left side being identical but reversed; and,

FIG. 6 is a rear elevational view thereof. 

The ornamental design for caster support, as shown and described. 